Question

calculate the number of moles of (1) calculate the atom infigram 5g of calcium atomic mass of calcium is 40u​

Answer 1

Answer:

(Atomic mass of calcium =40u). Thus, there are 0.125 mole in 5 grams of calcium. Thus, 5 grams calcium constitute 0.125 mole of calcium.

Explanation:

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Answer 2

Answer:

Number of moles

$= \frac{mass(i n \: grams)}{molar \: mass} \\ \\ \\ = \frac{5}{40} \\ \\ \\ = \frac{1}{8} \: \: moles \\ \\ \\ = 0.125 \: \: moles$

No of molecules= 0.125×6.023 × 10²³

=7.52× 10²² molecules